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adding "selected currencies" reactive var example #362

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merged 2 commits into from
Oct 3, 2020
Merged

adding "selected currencies" reactive var example #362

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ff6fd03
adding "selected currencies" reactive var example
ivnnv Oct 3, 2020
d315487
improved demo example
ivnnv Oct 3, 2020
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57 changes: 38 additions & 19 deletions examples/web/src/index.tsx
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Original file line number Diff line number Diff line change
@@ -1,8 +1,7 @@
import React from 'react';
import { render } from 'react-dom';

import { ApolloProvider, ApolloClient } from '@apollo/client';
import { Query } from '@apollo/client/react/components';
import { ApolloProvider, ApolloClient, useQuery, makeVar, useReactiveVar } from '@apollo/client';
import gql from 'graphql-tag';
import { InMemoryCache } from '@apollo/client/core';
import { CachePersistor } from 'apollo3-cache-persist';
Expand Down Expand Up @@ -46,23 +45,43 @@ const ratesGQL = gql`
}
`;

const ExchangeRates = () => (
<Query query={ratesGQL} fetchPolicy="network-only">
{(result) => {
const { error, data, loading } = result;
if (loading) return <p>Loading...</p>;
if (error) return <p>Error :(</p>;

return data.rates.map(({ currency, rate }) => (
<div key={currency}>
<p>
{currency}: {rate}
</p>
</div>
));
}}
</Query>
);
const selectedCurrenciesVar = makeVar<String[]>([]);

const ExchangeRates = () => {
const selectedItems: String[] = useReactiveVar(selectedCurrenciesVar);
const { error, data, loading } = useQuery(ratesGQL, { fetchPolicy: "network-only" });

if (loading) return <p>Loading...</p>;
if (error) return <p>Error :(</p>;

const toggleSelectedCurrency = (currency) => {
let newSelectedItems: String[] = [];

if (selectedItems.some(i => i === currency))
newSelectedItems = selectedItems.filter(i => i !== currency);
else
newSelectedItems = [...selectedItems, currency]

selectedCurrenciesVar(newSelectedItems);
}

return data.rates.map(({ currency, rate }) => {
const isCurrencySelected = selectedItems.some(i => i === currency);

return (
<div key={currency}>
<label>
<input
checked={isCurrencySelected}
type="checkbox" id="currency" name="currency"
onChange={() => toggleSelectedCurrency(currency)}
/>
{`${currency}: ${rate}`}
</label>
</div>
)
});
};

createClient().then(client => {
const App = () => (
Expand Down